fix(android): forward-port getReactContext to new arch bridgeless mode

[mikehardy]

...but do so in a way that is backwards-compatible as the symbols required

• do not show up at all until react-native 0.73
• moved to different package names in 0.74

Test plan:

I used this script, on my react-native 0.76 testing branch, to verify that it worked:

https://github.com/mikehardy/rnfbdemo/blob/rn76/notifee-demo.sh

I verified it down to react-native 0.72 by changing this line to the various stable versions (0.75.4, 0.74.6, 0.73.10, 0.72.17):

https://github.com/mikehardy/rnfbdemo/blob/1064dcd31a031e9abb53f2611bf32fda5470ee28/notifee-demo.sh#L4

Of particular note is that it contains the patch which I propose here, and is what made things work, with a huge debt of gratitude to @Eclipses-Saros for the initial investigation, idea, and testing. My contribution was making it reflective for backwards compatibility then back-testing it from 0.76.0-rc.6 down to 0.72.17

The test is simply to build the app on android, display a notification, and interact with the notification to make sure events are registered.

The notifee-demo.sh script installs an App that does that - it posts notification and logs the events

Before this patch, the events stopped working with either new architecture enabled on older react-native versions, or with react-native 0.76 in the default configuration (which is new arch enabled + bridgeless)

With the patch, things work everywhere all the time.

Fixes #621
Related #1077

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.08%. Comparing base (bf9618e) to head (64dc8fa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1127   +/-   ##
=======================================
  Coverage   77.08%   77.08%           
=======================================
  Files          32       32           
  Lines        1727     1727           
  Branches      579      556   -23     
=======================================
  Hits         1331     1331           
- Misses        343      395   +52     
+ Partials       53        1   -52     

[mikehardy]

Here is the patch if anyone wants to test it:

https://github.com/mikehardy/rnfbdemo/blob/rn76/patches/%40notifee%2Breact-native%2B9.1.1.patch

diff --git a/node_modules/@notifee/react-native/android/src/main/java/io/invertase/notifee/NotifeeReactUtils.java b/node_modules/@notifee/react-native/android/src/main/java/io/invertase/notifee/NotifeeReactUtils.java
index 4c3b169..549bcf0 100644
--- a/node_modules/@notifee/react-native/android/src/main/java/io/invertase/notifee/NotifeeReactUtils.java
+++ b/node_modules/@notifee/react-native/android/src/main/java/io/invertase/notifee/NotifeeReactUtils.java
@@ -12,6 +12,8 @@ import android.os.Handler;
 import android.os.Looper;
 import android.util.Log;
 import android.util.SparseArray;
+
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.ProcessLifecycleOwner;
@@ -105,11 +107,41 @@ class NotifeeReactUtils {
     }
   }
 
+  @SuppressLint("VisibleForTests")
   private static @Nullable ReactContext getReactContext() {
-    ReactNativeHost reactNativeHost =
+    try {
+
+      // Carefully try to load new architecture classes so we preserve backwards compatibility
+      // These symbols are only available in react-native >= 0.73
+      try {
+        Class<?> entryPoint = Class.forName("com.facebook.react.defaults.DefaultNewArchitectureEntryPoint");
+        Method bridgelessEnabled = entryPoint.getMethod("getBridgelessEnabled");
+        Object result = bridgelessEnabled.invoke(null);
+        if (result == Boolean.TRUE) {
+          Log.d("getReactContext", "We are in bridgeless new architecture mode");
+          Object reactApplication = EventSubscriber.getContext();
+          Method getReactHost = reactApplication.getClass().getMethod("getReactHost");
+          Object reactHostInstance = getReactHost.invoke(reactApplication);
+          Method getCurrentReactContext = reactHostInstance.getClass().getMethod("getCurrentReactContext");
+          return (ReactContext)getCurrentReactContext.invoke(reactHostInstance);
+        } else {
+          Log.d("getReactContext", "we are NOT in bridgeless new architecture mode");
+        }
+      } catch (Exception e) {
+        Log.d("getReactContext", "New Architecture class load failed. Using fallback.");
+      }
+
+      Log.d("getReactContext", "Determining ReactContext using fallback method");
+      ReactNativeHost reactNativeHost =
         ((ReactApplication) EventSubscriber.getContext()).getReactNativeHost();
-    ReactInstanceManager reactInstanceManager = reactNativeHost.getReactInstanceManager();
-    return reactInstanceManager.getCurrentReactContext();
+      ReactInstanceManager reactInstanceManager = reactNativeHost.getReactInstanceManager();
+      return reactInstanceManager.getCurrentReactContext();
+    } catch (Exception e) {
+      Log.w("getReactContext", "ReactHost unexpectedly null", e);
+    }
+
+    Log.w("getReactContext", "Unable to determine ReactContext");
+    return null;
   }
 
   private static void initializeReactContext(GenericCallback callback) {
@@ -121,7 +153,7 @@ class NotifeeReactUtils {
     reactInstanceManager.addReactInstanceEventListener(
         new ReactInstanceManager.ReactInstanceEventListener() {
           @Override
-          public void onReactContextInitialized(final ReactContext reactContext) {
+          public void onReactContextInitialized(@NonNull final ReactContext reactContext) {
             reactInstanceManager.removeReactInstanceEventListener(this);
             new Handler(Looper.getMainLooper()).postDelayed(callback::call, 100);
           }

[mikehardy]

This PR did not affect the iOS code thus that CI failure is a flake (and indeed, there is some issue with the simulator even starting the app). Not blocking

[mikehardy]

This is released as 9.1.2